2. Blow the air conditioner to prevent the shoulder and back from getting cold and discomfort. If you are in a public place with low air conditioning temperature, you can add a shawl. Long-term air conditioning blowing directly on the shoulders and back may cause pain and other discomfort. At home or outdoors, you can give yourself some opportunities to sweat and get rid of moisture. If you break out in a sweat, don't enter the room with low air conditioning temperature immediately, because at this time, the pores are open and cold air enters, which is easy to catch a cold.